Echinocereus subinermis Scheer

Body solitary, globular to cylindrical to 15 cm long, 7-9 cm wide with 5-9 prominent ribs. Areoles woolly with 1 central spine to 5 mm and 3-8 radial spines, or almost spineless at maturity. Flowers yellow, 8 cm wide.

NW Mexico

Source: Forbes, S. (1997). Echinocereus. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

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kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Echinocereus Engelm.